单轴循环冲击下弱风化花岗岩的损伤演化

闫雷; 刘连生; 李仕杰; 杨道学; 刘伟

doi:10.11883/bzycj-2019-0354

单轴循环冲击下弱风化花岗岩的损伤演化

doi: 10.11883/bzycj-2019-0354

闫雷^1,,
刘连生^{1, 2, ,},
李仕杰¹,
杨道学¹,
刘伟¹

1.
江西理工大学资源与环境工程学院，江西赣州 341000
2.
江西理工大学江西省矿业工程重点实验室，江西赣州 341000

基金项目: 国家自然科学基金（51404111）；江西省自然科学基金（20192BAB206017）；江西理工大学清江优秀人才支持计划（JXUSTQJYX2016007）

详细信息

作者简介:
闫　雷（1994－　），男，硕士研究生，yanleijxust@163.com

通讯作者:
刘连生（1979－　），男，博士，教授，lianshengliu@jxust.edu.cn

中图分类号: O382
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- 文章访问数: 4773
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- 被引次数: 0
出版历程
- 收稿日期: 2019-09-15
- 修回日期: 2019-10-23
- 网络出版日期: 2020-04-25
- 刊出日期: 2020-05-01

Damage evolution of weakly-weathered granite under uniaxial cyclic impact

YAN Lei^1
,,
LIU Liansheng^{1, 2
, ,},
LI Shijie¹,
YANG Daoxue¹,
LIU Wei¹

1.
School of Resource and Environmental Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
2.
Jiangxi Key Laboratory of Mining Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China

摘要

摘要: 为研究爆破应力波作用下弱风化花岗岩的力学特性和损伤演化机理，利用直径50 mm的改进分离式Hopkinson压杆装置，开展以不同速度对花岗岩进行单次和等速循环冲击下的实验研究。研究结果表明：单次冲击中，用能量法确定的损伤阈值，可用于循环冲击实验中；不同应变率下弱风化岩石裂纹扩展阶段存在应力松弛平台，且随应变率升高而愈发明显，峰值应力与应变率呈正相关。等速循环冲击中，最大应力、应变与冲击速度呈正相关，与岩样累积冲击总次数呈负相关；损伤演化具有3个阶段呈倒S形，由其构建的双参数损伤演化模型拟合效果理想，且具有物理意义；利用模型中的参数α和β可计算中值点处的损伤度和相对循环次数，且与冲击速度正相关；不同损伤变量计算的损伤演化模型不同，合理定义损伤变量是必要的。
- 弱风化花岗岩 /
- 循环冲击 /
- 损伤阈值 /
- 演化模型
Abstract: In order to study the mechanical properties and damage evolution mechanism of weakly-weathered granite under blasting stress wave, single and constant-velocity cyclic impact tests on the granite specimens at different velocities were carried out using a modified split Hopkinson pressure bar (SHPB) with the diameter of 50 mm. The results show that the damage threshold determined by the energy method in single-impact tests can be used in the cyclic-impact tests. The stress relaxation platform exists in the crack propagation stage of the weakly-weathered granite at different strain rates, and it becomes more obvious with the increase of strain rate. The peak stress is positively correlated with strain rate. In the cyclic impact, the maximum stress and strain are positively correlated with the impact velocity, and negatively correlated with the total number of cumulative impacts; the damage evolution can be divided into three stages taking on an inverted-S shape, and a damage evolution model with two parameters is established by it. The fitting effect of the model is ideal and has physical significance; the damage degree at the median point and the relative number of cycles can be calculated by using the parameters α and β in the model, are positively correlated with the impact velocity. The damage evolution models described by different damage variables are different, so it is necessary to define the damage variables reasonably.
- weakly-weathered granite /
- cyclic impact /
- damage threshold /
- evolution model

HTML全文

图 1 加工好的部分岩石试样

Figure 1. Processed weakly-weathered granite specimens

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图 2 SHPB实验系统

Figure 2. SHPB experimental system

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图 3 岩样E4动态力平衡检验

Figure 3. Dynamic stress balance check for specimen E4

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图 4 加载段单位体积能量计算

Figure 4. Volume energy calculation for load segment

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图 5 不同速度单次冲击的应力-应变曲线及破坏形式

Figure 5. Stress-strain curves and failure modes of the specimens subjected to single impact at different velocities

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图 6 不同速度循环冲击岩样的应力-应变曲线及其破坏形式

Figure 6. Stress-strain curves and failure modes of different specimens subjected to cyclic impact at different velocities

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图 7 不同冲击速度下不同岩样最大轴向应变的演化

Figure 7. Evolution of the maximum axial strain with cyclic-impact number at different impact velocitiesfor different specimens

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图 8 不同损伤定义下的损伤演化模型

Figure 8. The damage evolution models represented by different damage variables

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图 9 参数α和β对损伤累积模型的影响

Figure 9. Effects of parameters α and β on the damage accumulation model

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表 1 单次冲击和首次循环冲击实验结果

Table 1. Single impact and first cycle impact test results

编号	v/(m·s⁻¹)	W_i/J	L/D	n_eff/%	ρ/(g·cm⁻³)	v_l/(m·s⁻¹)	σ_dc/MPa	$ \dot \varepsilon$/s^-1	N
A1	3.69	8.85	1.02	2.35	2 477	3 628	24.76	22.11	1
A3	4.06	12.80	1.04	2.47	2 456	3 601	27.01	29.04	1
B1	5.04	20.03	1.03	2.50	2 455	3 594	36.06	35.19	1
C1	5.97	27.25	1.03	2.32	2 434	3 634	38.93	44.61	1
D5	6.94	37.92	1.03	2.45	2 457	3 605	42.18	53.67	1
E1	7.92	52.65	1.03	2.36	2 472	3 625	59.31	62.16	1
F1-1	3.92	10.41	1.03	2.41	2 446	3 614	31.31	16.42	17
G3-1	4.98	15.39	1.02	2.37	2 426	3 623	36.84	26.59	11
H2-1	5.87	25.22	1.04	2.55	2 406	3 583	49.00	35.99	5

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